Hydra Cluster

The Hydra Cluster (or Abell 1060) is a galaxy cluster that contains 157 bright galaxies, appearing in the constellation Hydra.[4] The cluster spans about ten million light-years and has an unusually high proportion of dark matter.[5] The cluster is part of the Hydra-Centaurus Supercluster located 158 million light-years from Earth. The cluster's largest galaxies are elliptical galaxies NGC 3309 and NGC 3311 and the spiral galaxy NGC 3312 all having a diameter of about 150,000 light-years.[6] In spite of a nearly circular appearance on the sky, there is evidence in the galaxy velocities for a clumpy, three-dimensional distribution.[7]

Not to be confused with Hydra-Centaurus Supercluster.

Hydra Cluster
A map of Hydra cluster
Observation data (Epoch J2000)
Constellation(s)Hydra
Right ascension 09h 18.0m[1]
Declination−12° 05′[1]
Number of galaxies157[2]
Richness class1[3]
Bautz–Morgan classificationIII[3]
Redshift0.0548 (16,452 km/s)[1]
Distance
(co-moving)		58.3 Mpc (190.1 Mly) h−1
0.705
X-ray flux6.1×10−11 erg s−1 cm−2 (0.5–2 keV)[1]
Other designations
Abell 1060

References
  1. "NASA/IPAC Extragalactic Database". Results for Abell 2151. Retrieved 13 June 2013.
  2. "National Optical Astronomy Observatory". Galaxies. Retrieved 19 July 2007.
  3. Abell, George O.; Corwin, Harold G., Jr.; Olowin, Ronald P. (May 1989). "A catalog of rich clusters of galaxies" (PDF). Astrophysical Journal Supplement Series. 70 (May 1989): 1–138. Bibcode:1989ApJS...70....1A. doi:10.1086/191333. ISSN 0067-0049. Retrieved 12 March 2012.
  4. Wehner and Harris, p.1
  5. Nemiroff, R.; Bonnell, J., eds. (16 April 2001). "The Hydra Cluster of Galaxies". Astronomy Picture of the Day. NASA.
  6. The Hydra Supercluster An Atlas of the Universe.com
  7. Fitchett, Michael; Merritt, David (December 1988). "Dynamics of the Hydra I Galaxy Cluster". The Astrophysical Journal. 335: 18–34. Bibcode:1988ApJ...335...18F. doi:10.1086/166902.


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